Jennifer Lopez in Anthony Vaccarello. She took the stage to give out the first award of the Grammys, struck a pose and noted that she "got the memo" about the dress code.

Jennifer Lopez in Anthony Vaccarello. She took the stage to give out the first award of the Grammys, struck a pose and noted that she "got the memo" about the dress code. (Kirk McKoy / Los Angeles Times; Mike Nelson / EPA)

In an emailed Wardrobe Advisory sent by the CBS's Standards and Practices committee, Grammys attendees were cautioned against sheer see-through clothing, "thong type costumes" and "exposing bare fleshy under curves of the buttocks and buttock crack. Bare sides or under curvature of the...